We actually can't do that and aslo it's so useless. Firstly people holding bitcoins for price increase and buying bitcoins when price is low. Secondly price depends on fiat anyway.
i guess there is no such things and that's impossible also people will like if prices fall for a while because they can buy and will sell their bitcoin when prices rise up
Of course people would like it when the price falls. This way, people can buy it at lower prices to actually be a part of the cryptocurrency. What I'm trying to say is that it actually would be nice if we could locate a way to buy and sell effectively and not have to let it be such a gamble. How would you feel if you had $500 being held then all of a sudden you had only $359? It's tragic and rather concerning.